Means for constructing air-cooled cylinders



May 13, 1947. VANG 2,420,332

MEANS FOR CONSTRUCTING AIR-COOLED CYLINDERS Filed Dec. 11, 1943 WELDING OUTFIT 0 INSULATION 27 INVENTOR. AL FRED VANG.

ArrqxuEvg Patented May 13, 1947 UNITED STATES PATENT OFFICE MEANS FOR. CONSTRUCTING AIR-COOLER CYLINDERS 4 Claims.

This invention is a continuationein-part of the one embodied in my application for patent, filed April 3, 1943, under Serial No. 481,722, new Patent No. 2,396,216, dated March 5, 194 .6, and related to new and useful improvements in means for constructing air-cooled cylinders for engines, refrigerator systems, heating systems, and other purposes. 'lhus, it may in like manner be applicable to any hollow object to which it is desired to impart the characteristics of my invention.

More particularly this invention refers to the apparatus, by means of which the construction herein set forth is accomplished.

Fundamentally this construction of an air cooled cylinder consists in closely spot welding fin material of great thermal conductivity directly upon the steel cylinders of the engine. Preferably, this fin material will be aluminum, as this material has a great conductivity constant at high temperatures. Other materials may also be used, such as copper. At relatively lower temperatures copper is a better conductor of heat, but at the high temperatures proposed for the improved engine, aluminum will be ideal.

The invention contemplates a novel means for carrying out my ideas, which is characterized by a spot welding outfit, having a of else trodes adapted to be located inside and outside of the wall ar a of a cylinder, and associated means with the cylinder and the electrodes for feeding the material and simultaneously turning the cylinder and closely spot welding the fin material on to the latter.

It is to be understood that, while my invention has been described herein as preferably pertaining to air-cooled cylinders for engines, it is well within the scope of the invention to use water or any other uitable medium as a cooling agent.

In the following description of the invention like numerals indicate similar parts throughout the drawing, in which:

Figure l is a sectional view of one of the cylinders of an air-cooled engine, embodying this invention.

Figure 2 is a fragmentary enlarged detailed view of a portion of Figure 1, but with a front portion of the cylinder being illustrated.

Figure 3 is a sectional view of the cylinder shown in Figures 1 and 2, but illustrated in conjunction with means for constructing the cylinder with the fins, in accordance with this invention.

Figure l is a schematic View of the welding outfit used in this invention, while Figure 5 is a sectional view of a modified form of the fin material.

In Figure 1, reference numeral l0 indicates generally the steel cylinder of an internal combustion engine. This cylinder is shown provided with a cylinder head 12. The cylinder is also provided with fins 3 for assisting in radiating the heat of combustion. The invention relates to the application of these fins 13.

In Figure 2 a detail is disclosed of the fins l3. It should be noted that they are formed from a strip of material wound helically on the cylinder iii. This strip of material is substantially of an L-shape or slotted L-shape, in transverse cross section, so as to have an arm portion l3a which engages against the outside diameter of the cylinder ill and a radially projecting arm portion I32), from which the heat radiates freely. The invention particularly proposes that the fins Ill be made of aluminum or other material of great thermal conductivity. The invention relates to the welding of the fin material 3 to the steel cylinder 53.

In order to facilitate the attachment of the strip of fin material, some of which may show some resistance to the winding or curling proc ess, the L portion of said material may be slotted, as shown in Figure 5, thereby obtaining also, a greater number of heat radiating members.

In Figures 3 and i a detail has been shown of the means for welding the fin material in position. The cylinder ill is rotativcly supported by an end disc is, which is engaged in one end thereof. This end disc is mounted on a shaft is, rotatively supported in a standard ll. A spring l8 urges the disc l5 into the end of the cylinder ill.

A pair of friction rollers E9 and 2B frictionally engage opposite points upon one side of the cylinder it. Specifically, the friction rollers l9 and 2! are located inside and outside of the cylinder ill. These rollers are mounted on the shafts of a drive system 23, which is designed so that the cylinder is will be slowly turned.

A spot welding outfit 21, having a gang of electrodes 25 and 2% located inside and outside of a wall area of the cylinder I5, is arranged to C: der. The electrodes 25 and 25 have contact and 25a for engaging the work, and

cylinder The distributor 25 has a rotating arm 28, which engages the contacts 3'3 and El in succession to close the electrical circuit to the individual electrodes of the gang of e1ectrodes, so that they work one pair at a time. The details of the spot welding outfit will not be given in this s ecification as it forms no part of the invention and any type of outfit may he used. The type recommended would be like that disclosed in my invention covered by the U. S. Patent No. 2,287,544, issued June 23, 1942, and entitled Electric welding of metals and the uniting of dissimilar metals.

The operation of the device is as follows:

l'he fin material l3 may be drawn off from supply spool or supplied in any other desirable way. t is helically wound on th cylinder it! in the manner illustrated in Figures 2 and 3. It may be closely soot welded as it is helically Woun on the cylinder, or it may be subsequently spot welded after it has been placed in posit-ion.

The spot welding operation must be carried out as follows: The gang of electrodes 25 and is started at one end of the fin material l3. lhe cylinder slowly rotates and the gang of electrodes move gitudinally along the helical for mation. Boring his motion the electrodes individually spot weld points of the fin material and the cylinder. These points i ust he very closely spaced together. In fact, they must be so closely spaced that they overlap. This welding operation may be carried on in one operation, or the spot eldin may be carried on more than one oper t When the latter system is used the spot lg ll s not spaced so closely, but then spot welding is done in betwee the st group of soot weldings. In

is cl osely spot welded,

There is no a binder be- 'ior patent, 'ough the materials pointed out that tie in mater a1 1 irectly welded to the cylinder tionable film w induction of heat is broken up f the fin material will be in in .vith the molecules of the cyl n so. there will be free condu e cyllider ill to the fins will be found that the thermal efficiency o5 the rad ing system of the cylinder when contructel in ac nee with this invention will higher than with the past prior construction. Because of this, the engine may he designed to produce more horsepower per unit of weight. The advantages of this have already been discussed in the object portion of this specification.

It is obvious that slight changes may be made in the form, construction, and arrangement of the several parts, as shown, within the scope of 4 the appended claims, without departing from the spirit of invention, and I do not therefore, wish to limit myself to the exact construction and arrangement shown and described herein.

Having thus described my invention, what I as new and desire to secure by United. States Letters Patent is:

l. A device for welding fins from strip material i. cross section helically wound on a cylinder 0 the latter; said device comprising means for 'uppcrting and rotating the cylinder and substan- :ally preventing longitudinal movement of the rt t C 5) M,

der, and electrode mounted to move sub- 'udinal of the cylinder and to enagainst the sides of the fin and the base cof, whereby on rotation of the cylinder and the electrode is lonftudinally fed along the cylinder by the fin in a screw-like manner.

2. machine for welding angle metal fin material, helically disposed on an engine cylinder, to the latter; said machine comprising head and tail supporting standards adapted to receive the cylinder therebetween, means on the tail standard for rotatably mounting the tail end of the cylinder, pair of electrodes adapted to engage the interior wall and the fin respectively, a source of current connected to the electrodes, inner and outer drive shafts rotatably mounted on said head standard in the same plane with and parallel to the axis of the cylinder, and inner and outer friction wheels remote from the electrode and source and mounted on said drive shafts and in the same plane, and adapted to engage adjacently the inner and outer walls of one end of the cylinder.

3. A machine for welding angl metal fin material, helically disposed on an engine cylinder, to the cylinder; said machine comprising substantially parallel head and tail supporting standards, adapted to receive the cylinder therebetween, means for rotatably mounting the tail end of the cylinder, resilient support frame having an inner and adapted to be received in the hollow of the cylinder and an outer end adapted to be disposed exterior of the cylinder and opposite the inner end of said frame, a pair of lectrodes mounted on said ends and adapts to engage the and fin, respectively, inner and outer drive shafts rotatably mounted on said head standard in the same plane with and paralle to the axis of the cylinder, and inner and outer friction WJQSIS remto from the electrode and source and mounted on said drive shafts and in the same plane, and adapted to engage adjacently the inner and outer walls of the head end of the cylinder.

4. A machine for welding angle metal fin material, helically disposed on in engine cylinder, to the cylinder; said machine comprising substantially parallel head and tail supporting standards adapted to receive the cylinder therebetween, a tail shaft rotatahly mounted on the tail standard and projecting inwardly, a disk on the inner end of the tail she t in axial aline ment therewith and adapted to be received in one end of the cylinder, wh reby the cylinder disk and shaft rotate about a common axis, a resilient support frame having an inner end adapted to be received in the hollow of the cylinder and an outer end adapted to be disposed exterior to the cylinder and opposite the inner end of the frame, a pair of electrodes mounted on said ends and adapted to engage the cylinder and fin respectively, a source of current connected to the electrodes, inner and outer drive shafts 5 rotatably mounted on said head standard in the same plane, with and parallel to the axis of the cylinder, and inner and outer friction wheels remote from the electrode and source and mounted on said drive shafts and in the same plane and adapted to engage adjacently the inner and outer Walls of one end. of the cylinder.

. ALFRED VANG.

REFERENCES CITED 'Ihe following references are of record in the file of this patent:

Number UNITED STATES PATENTS Name Date Pierce et a1. Sept. 9, 1919 Tobey (1) Oct. 5, 1925 Tobey (2) Oct. 5, 1925 Riemensehneider Oct. 3, 1939 Tobey (3) Oct. 5, 1926 Naylor Sept. 6, 1932 Schryber Mar. 21, 1944 Robbins -1 Sept. 6, 1881 

